2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
5 Jan Nieuwenhuizen <janneke@gnu.org>
7 LilyPond is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 LilyPond is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
29 Return the 2-log, rounded down
35 error ("intlog2 with negative argument: " + ::to_string (d));
50 return log (x) / log (2.0);
54 directed_round (Real f, Direction d)
63 0 at threshold, 1 at 0, with 1/x falloff.
66 peak_around (Real epsilon, Real threshold, Real x)
70 return std::max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
74 0 at 0, 1 at standard_x, and increasing thereafter.
77 convex_amplifier (Real standard_x, Real increase_factor, Real x)
79 return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
83 camel_case_to_lisp_identifier (const string &in)
87 /* don't add '-' before first character */
88 out.push_back (char (tolower (in[0])));
90 for (size_t inpos = 1; inpos < in.size (); inpos++)
92 if (isupper (in[inpos]))
94 out.push_back ( char (tolower (in[inpos])));
97 string result (&out[0], out.size ());
98 replace_all (&result, '_', '-');